Bomag 05717699 Piston Ring Set

The Bomag 05717699 Piston Ring Set is a genuine OEM component designed for Bomag cold milling machines, refuse/landfill compactors, soil compactors, and recycler/stabilizers. Sourced directly from Bomag, this piston ring set delivers an exact match to the original engine specification, ensuring correct ring geometry, material grade, and sealing performance. Compatible machines include the BM 2000/60, BM 2000/60-2, BC 772 RB-2, BC 672 RB-2, BC 772 RS-2, BC 972 RB-2, BC 1172 RB-2, BC 772 EB-2, BC 672 EB-2, MPH 122-2, and MPH 125. As a direct OEM replacement, this set installs without modification and restores engine compression to original operating parameters.

Key Features

• Genuine OEM Sealing Integrity — manufactured to Bomag's original ring profile, cross-section tolerances, and material hardness specifications, ensuring consistent cylinder-wall contact and long-term compression retention
• Drop-In Engine Replacement — matches the original piston ring set exactly, installing into the existing cylinder bore without machine alterations or additional hardware
• Broad Machine Coverage — fits Bomag BM 2000/60 and BM 2000/60-2 cold milling machines, BC-series refuse/landfill and soil compactors (BC 772 RB-2, BC 672 RB-2, BC 772 RS-2, BC 972 RB-2, BC 1172 RB-2, BC 772 EB-2, BC 672 EB-2), and MPH 122-2 and MPH 125 recycler/stabilizers
• Compression and Oil Control Restored — worn or broken piston rings allow combustion gases to bypass the piston, causing power loss, excessive oil consumption, and engine damage; replacing with part number 05717699 restores proper cylinder sealing across all operating loads
• Engine Protection at High Duty Cycles — heavy equipment engines run under sustained load and high heat; OEM-grade ring material and surface finish resist premature wear and micro-welding to the cylinder wall under these demanding conditions

Piston rings form the dynamic seal between the piston and the cylinder wall inside the engine. They serve three functions simultaneously: containing combustion pressure above the piston to generate power, controlling the thin film of oil on the cylinder wall to prevent consumption and fouling, and transferring heat from the piston into the cooled cylinder bore. When rings wear, crack, or lose tension, combustion gases blow past the piston — a condition known as blowby — which reduces power output, increases fuel consumption, and allows oil contamination that accelerates wear throughout the engine. Replacing a worn set with the correct OEM piston ring set is one of the most effective engine rebuild steps for restoring full compression and extending service life on high-hour heavy equipment.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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